Long time ago I owned a Vixen 4" f/10 achromat made in Japan.
Never liked the strong blue fringe around moon and the planets.
I shortly owned a 5" Meade ETX UHTC Maksutov. Features on planets really started to show. No comparison to a crappy false colour ladden 4" achromat.
And I wish to add: It was impossible to observe Mars with the Vixen 4" f/10 achromat. Post #175 and the link therein that confirms my experience: https://www.cloudyni...teed-fan/page-7
I would rather have a decent 4 inch F/10 achromat than the Starmax 127mm I that I owned for a while. Viewing the planets with a moderate focal length achromat can be done with color filters,. CO's and poor optics cannot be fixed.